Rod packing for hydraulic doorchecks



v L. c; NORTON.

ROD PACKING FOR HYDRAULIC DO0RCHECKS.

APPLICATION FILED Amil9, I9I8.

1, 13,546, Patented Dec. 12, 11922...

patented Dec. 112, 1922.

warren stares LEWIS C. NORTON, OF CHICAGO, ILLINOIS.

ROD PACKING FOB. HYDRAULIC DOORCHECKS.

Application filed August 19, 1918. Serial No. 250,422.

To all whom it may concern:

Be it known that I, LEWIS C. NORTON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Rod Packings for Hydraulic Doorchecks, of which the following is a full, clear, concise, and exact'description, reference being had to the accompanying drawing, forminga part of this specification.

My invention relates to improvements in hydraulic door-checks of the type in which a liquid dash-pot chamber and a spring chamber disposed adjacent thereto are separated by a partition, through which an operating shaft is'passed for operative connection with pistons located within said dash-pot chamber.

One object of my invention is to provide an improved packing means located in the partition separating the liquid dash-pot chamber from the spring chamber and surrounding the operating shaft, whereby leakage from the dash-pot chamber to the spring chamber is prevented.

A further object is to provide an improved construction in which there is a good, substantial bearing between the shaft and the packing nut.

Further objects will appear from the detailed description to follow and from the appended claims.

An embodiment of my invention is shown in the accompanying drawings forming a part of my application and in which Fi 1 is a perspective view showing a comp ete doorcheck ready for application to a door;

Fig. 2 is a vertical longitudinal section showing the cogstruction of the dash-pot and spring chambers of the device; and

Fig. 3 is an enlarged detail section showing the improved packing means which constitute the present invention.

The preferred form of construction as shown in the accompanying drawings comprises a dash-pot chamber 1 and a spring chamber 2- disposed thereabove, the axis of the chamber 2 intersecting the axis of the chamber 1 at a medial point therein. An operating shaft 3 is journaled at the lower end thereof in a bearing 4 provided in the chamber 1, and at the upper end is a cap 4* provided on the chamber 2 through the medium-of a sleeve 5 which turns with said shaft. Formed integral with the sleeve 5 is a toothed wheel 6 which engages a pawl 7 pivoted to an arm 8 for adjusting the tension of a spiral spring 9 arranged in the chamber 2. One end of the spring 9 is secured to the wall of the chamber 2 and the other-end engages a groove 10 provided in the sleeve 5, this construction, although not shown indetail, being well understood by those skilled in the art.

A pinion 11 is secured to the shaft 3 and meshes with a toothed rack 12 which is formed integral with the pistons 13 operatmg in the chamber 1. Each piston 13 is provided with a ball check-valve 14 which closes automatically for forcing liquid contained 1n the chamber 1 through restricted by-pass passages (not shown) when a piston moves toward the end of the dash-pot by rotation of the pinion 11.

The chamber 1 should be kept full of liquid for efficiency of operation; consequently it is essential to prevent leakage around the shaft 3 where it passes through a partition 15 separating the chamber 1 from thee-hambeer 2. To this end a shoulder 16 is formed on the shaft 3, and interposed between said shoulder and the upper shoulder of the pinion 11 is a cup 17 having upwardly-extending side walls, as clearly shown in Fig. 3.

Seated on the upper edge of said side walls and in the bottom of the cup 17 are leather packing rings 18 and 19, respectively. A packing nut 20 screwed into the partition 15 is provided with surfaces 21 and 22 in different planes for abutting packing rings 18 and 19, respectively, and the size of sad nut between said surfaces is smaller than the internal diameter of said cup, whereby an annular air chamber 23 is formed. A bore 24 and counterbore 25 are formed in nut 20,

ers of yieldable packing 29 may rest on a level surface. These packing layers are ringshaped 'and are pressed inwardly against shaft 3 by means of a washer 30 having an upwardly and inwardly extending lower surface, the outer surface of said washer being free to slide in counterbore 25.

In order to compress Packing 29 and to maintain packing rings 18 and 19 in contact with their respective surfaces, a nonrotatable helical spring 31 is provided to exchamber 23, thence past packing ring 19 to the litharge packing 28, and thence upwardly along shaft 3 through the packing layers 29. And since it is quite impossible for any appreciable amount of liquid to leak through so many packings the device has proven to be very eflicient in use. turning of'shaft 3 is determined by the friction of the various packings, but this friction can be regulated by providing a spring 31 of the proper tension.

It will be noted that the ball bearing alleviates friction to quite an extent, since if a plain collar were provided spring31 would rub against the same.

This packing means is inexpensive to produce since all of the parts are concentric and consequently readily fitted to each other.

While I have illustrated and described the preferred form of construction for carrying my invention into eflect there might be variations and modifications without departing from the spirit of the invention. 1, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of suchvaria-tions and modifications as come within the scope of the appended claims.

Having thus described my invention what The resistance to I claim as new and desire to secure by Letters Patent is 1. A rod packing construction comprising a chamber for fluid under pressure, having an opening in its wall, an oscillatable shaft extending through said opening, a member secured to said shaft to oscillate therewith, and having a shoulder portion, a cup seated on said shoulder portion and having an upwardlyextending flange, a packing gland nut threaded into said opening and surrounding said shaft, and having a flange extending downwardly around said shaft inside said cup, a packing washer between said downwardly! extending flange and said cup, and a second packing washer between said upwardly extending flange and said packing gland nut.

2. A rod packing construction comprising a chamber for fluid under pressure, having an opening in one of its walls, an oscillataible shaft extending through said 0 ening, a

member oscillatable with said s aft, and

having a shoulder portion, a cup-shaped member seated on said shoulder, and having an upwardly extending flange, a packing gland nut in said opening, surrounding said shaft and having a downwardly extending flangeextending around said rod and into said cup, and a packing member between the upper edge of said cupand said packinggland nut.

3. A rod packing construction comprising a'chamber for fluid under pressure, having an opening therein, an oscillata'ble shaft extending through said opening, a packing gland nut having a portion surrounding said shaft and spaced therefrom, a metallic col- .lar surrounding said shaft between said packing gland nut and said shaft, means for making a fluid-tight connection between said. collar and said shaft, said packing gland nut having a packing recess therein, said recess having an annular shoulder flushwith the upper surface of said collar, a packing washer inserted in said recess and bearing on the upper edge of said collar and on said annular shoulder, and meansv for forcing said packing washer against said collar and flush shoulder.

In witness whereof, I have hereunto subnnwis c. NQRTON.

scribed my name. 

